Rename blahHandler to onBlah throughout dart:io.

tests/standalone/src/DartStdIOPipeTest.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Test a dart sub-process handling stdio with different types of
 // redirection.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
@@ skipping 25 matching lines @@
 
   // The shell script will run the dart executable passed with a
   // number of different redirections of stdio.
   String pipeOutFile = "${dir.path}/pipe";
   String redirectOutFile = "${dir.path}/redirect";
   List args =
       [getDartFileName(), dartScript, type, pipeOutFile, redirectOutFile];
   Process process = new Process.start(shellScript, args);
 
   // Wait for the process to exit and then check result.
-  process.exitHandler = (exitCode) {
+  process.onExit = (exitCode) {
     Expect.equals(0, exitCode);
     process.close();
 
     // Check the expected file contents.
     if (type == "0") {
       checkFileContent("${pipeOutFile}", "Hello\n");
       checkFileEmpty("${redirectOutFile}.stderr");
       checkFileContent("${redirectOutFile}.stdout", "Hello\nHello\n");
     }
     if (type == "1") {
       checkFileContent("${pipeOutFile}", "Hello\n");
       checkFileEmpty("${redirectOutFile}.stdout");
       checkFileContent("${redirectOutFile}.stderr", "Hello\nHello\n");
     }
     if (type == "2") {
       checkFileContent("${pipeOutFile}", "Hello\nHello\n");
       checkFileContent("${redirectOutFile}.stdout",
                        "Hello\nHello\nHello\nHello\n");
       checkFileContent("${redirectOutFile}.stderr",
                        "Hello\nHello\nHello\nHello\n");
     }
 
     // Cleanup test directory.
     dir.delete(true);
   };
 
-  process.errorHandler = (ProcessException error) {
+  process.onError = (ProcessException error) {
     Expect.fail(error.toString());
   };
 }
 
 // This tests that the Dart standalone VM can handle piping to stdin
 // and can pipe to stdout.
 main() {
   // Don't try to run shell scripts on Windows.
   var os = new Platform().operatingSystem();
   if (os == 'windows') return;
 
   // Get the shell script for testing the Standalone Dart VM with
   // piping and redirections of stdio.
   var shellScript = new File("tests/standalone/src/DartStdIOPipeTest.sh");
   if (!shellScript.existsSync()) {
     shellScript = new File("../tests/standalone/src/DartStdIOPipeTest.sh");
   }
   // Get the Dart script file which echoes stdin to stdout or stderr or both.
   var scriptFile = new File("tests/standalone/src/ProcessStdIOScript.dart");
   if (!scriptFile.existsSync()) {
     scriptFile = new File("../tests/standalone/src/ProcessStdIOScript.dart");
   }
 
   // Run the shell script.
   test(shellScript.name, scriptFile.name, "0");
   test(shellScript.name, scriptFile.name, "1");
   test(shellScript.name, scriptFile.name, "2");
 }